Che la luce si propaghi con una grandissima velocità e che lo faccia seguendo una linea retta sono spesso considerati come fatti evidenti, deducibili dall’esperienza quotidiana, senza bisogno di particolari dimostrazioni e ragionamenti.
Vedremo, invece, che si tratta di questioni estremamente complesse, che solo in tempi relativamente recenti hanno trovato una soluzione soddisfacente.
E’ inevitabile che le difficoltà concettuali incontrate nel corso di questa evoluzione, siano destinate a ripresentarsi nella interazione didattica con i nostri allievi.
Tre questioni fondamentali si pongono nella nostra riflessione sulla luce:
1) La luce è qualcosa che si propaga dalla sorgente agli oggetti, oppure questi si illuminano immediatamente, non appena la sorgente viene accesa ?
2) L’illuminamento avviene secondo linee rette o curve?
3) Se la luce si propaga, con quale velocità lo fa?
La prima questione è in un certo senso pregiudiziale. Se la luce, infatti, fosse uno “stato” di visibilità, che si stabilisce immediatamente in tutto lo spazio circostante, avrebbe ancora senso domandarsi secondo quali linee avviene l’illuminamento, non avrebbe senso domandarsi con quale velocità questo avvenga.
Usually posts some really interesting stuff like this. If you
thank you very much
We came across a cool website that you simply may well get pleasure from. Take a look for those who want.
What i don’t realize is actually how you’re not actually much more well-liked than you may be right now. You’re very intelligent. You realize therefore considerably relating to this subject, produced me personally consider it from numerous varied angles. Its like men and women aren’t fascinated unless it’s one thing to accomplish with Lady gaga! Your own stuffs nice. Always maintain it up!
Greetings! This is my first visit to your blog! We are a team of volunteers and starting a new project in a community in the same niche. Your blog provided us valuable information to work on. You have done a outstanding job!
I’m glad to be helpful.
Best wishes for your work.
Good write-up, I am normal visitor of one’s web site, maintain up the excellent operate, and It’s going to be a regular visitor for a long time.
I’m typically to running a blog and i actually admire your content. The article has actually peaks my interest. I’m going to bookmark your site and preserve checking for brand new information.
Thank you, I’ve recently been searching for information about this topic for ages and yours is the greatest I have discovered till now. But, what about the bottom line? Are you sure about the source?
I just want to mention I am all new to weblog and seriously liked your web-site. Probably I’m planning to bookmark your website . You certainly come with wonderful stories. Bless you for revealing your blog.
I just want to mention I am newbie to blogs and actually liked your website. Most likely I’m likely to bookmark your blog post . You actually have great writings. Appreciate it for revealing your web page.
I simply want to say I am new to weblog and absolutely enjoyed you’re web blog. Likely I’m likely to bookmark your blog post . You actually have good well written articles. Appreciate it for sharing your web page.